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From The Collaborative International Dictionary of English v.0.48:
octahedral \oc`ta*he"dral\ ([o^]k`t[.a]*h[=e]"dral), a. [See octahedron.] Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage; an octahedral crystal. [1913 Webster] octahedral borax (Chem.), borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or prismatic borax. Octahedral iron ore (Min.), magnetite. [1913 Webster]